misc: fix some warnings

misc: fix some warnings

sys-utils/prlimit.c: In function 'do_prlimit':
sys-utils/prlimit.c:367:16: warning: format '%ju' expects argument of type 'uintmax_t', but argument 2 has type 'rlim_t {aka long long unsigned int}' [-Wformat=]
     printf("<%ju", new->rlim_cur);

lib/plymouth-ctrl.c: In function 'open_un_socket_and_connect':
lib/plymouth-ctrl.c:88:20: warning: passing argument 2 of 'connect' from incompatible pointer type [-Wincompatible-pointer-types]
  ret = connect(fd, &su, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(su.sun_path+1));
                    ^
In file included from lib/plymouth-ctrl.c:35:0:
/usr/include/sys/socket.h:314:5: note: expected 'const struct sockaddr *' but argument is of type 'struct sockaddr_un *'
 int connect (int, const struct sockaddr *, socklen_t);

login-utils/last.c: In function 'list':
login-utils/last.c:506:54: warning: pointer targets in passing argument 4 of 'dns_lookup' differ in signedness [-Wpointer-sign]
   r = dns_lookup(domain, sizeof(domain), ctl->useip, p->ut_addr_v6);
                                                      ^
login-utils/last.c:291:12: note: expected 'int32_t * {aka int *}' but argument is of type 'unsigned int *'
 static int dns_lookup(char *result, int size, int useip, int32_t *a)
            ^~~~~~~~~~

In file included from sys-utils/hwclock-cmos.c:92:0:
sys-utils/hwclock.h:67:32: warning: 'struct timeval' declared inside parameter list will not be visible outside of this definition or declaration
 extern double time_diff(struct timeval subtrahend, struct timeval subtractor);

misc-utils/test_uuidd.c: In function 'create_nthreads':
misc-utils/test_uuidd.c:187:19: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
        proc->pid, (int) th->tid, th->index));

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>